Air-heating attachment for ranges.



'PATENTED JULY 31, 1906.

E. R. GAHooN'B. AIR HEATING .ImmoHMPNTJ:v POR .RANGB s.

APPLICATION FILED NOV-'30,` 1903. I

'S SHEETS-SHEET 1.

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1,/ lI .will l @www mr Hamers PETERS c y' PATBNTED 11113.31, 190s. E. R; GAHooNE. AIR HEATING.ATUTAGHMBNT'POR RANGES.

No, 827,210.l

APPLIOATIGN FILED NOV. 30, 1 903.

3 SHEETS-SHEET 2.

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To a/ZL whom it may concern:

cNrrn STATES A'oraron.

d O EDWIN R. cAHooNE, oryTR'oY, NEW YORK,

AIB-:HEATING ATTACHMENT FOJR HANC-FES.'

lBe it known that I, EDWIN R. CAHOONE, a citizen of the United States residing at Troy, in the county of Rensselaerand State of New -York, have invented new and useful Imovercomev certain disadvantages present in thestructures now in use.

The prime object of the invention is to pro vide an air-heating chamber, preferably at thev front of the stove, where they air is preliminarily heated and in this state is delivered to Aa plurality of ducts or minor chambers common to the preliminary' heating-chamber and finally introduced to the body of the fuel in'jets and deflected in streamsto the top of the fuel by a deflector. ,The air is thus taken from the atmosphere andpreliminarily heated and in subdivided streams of smaller volumes is secondaril andflnally heated and is introduced to the el in this state. air-exits are arranged to introduce the ro er proportion of ,air to the body of the e at different levels,` and the larger streams of .air introduced at the top mixes and augments the gases to create a high grade of combustion.

`A further object of the invention is to provide a specially-constructed airfduct to cof operate with the air-heating chambers referred to, that the gases liberated bythe jets andstr'eam's of air may be freely mixed with I a free supply of heatedair at the time and ent to constructan air-duct with-an o en botpoint the products of combustion have a tendency to be formed into smoke-gas, and to lmeet this emergency I have found it expeditom with depending lugs adjacent t e same to prevent the fuel packing,- as welly as to provide a greater heating-space aty the center than `at the end for the ready mixing and proper distribution of the air with the gases elow.

.In the drawings, Figure 1 is a vertical seclSpecification yof Letters Patent.

yApplication filed November 30, 1903. Serial No. 183.202.

'spective view of my improved air-duct. p Fig. 9 is al section of a modification.

The 'i yto provide a deflector 17, and in the front 'Patented July 31,1906.

view ofthe partition in' which the secondary air-heating chambers are formed. Fig. 7 is a detail perspective view of the form of partition shown in- Fig. 3. Fig. 8 is a detail pere l The numeral 1 represents astove. of the downdraft type; 2, the grate; 3, the front wall; 4, the t'op, and 5 the air-duct.

6 indicates a partition located in the front and forming a part of the fuel-chamber7. The partition 6 is provided on its front or inside with a series-of ribs 9, forming individual and secondary air-heating chambers 1 0. The partition is further provided within these An intermediate partition 13 depends from thev stove-top 4 to Within a short distance of the bottom 14, forming an opening 15, and-it rests against the front facesof the ribs 9. A shield 16 is located at the u per end ofthe partition 6 to deflect and diuse the heated air passing through the exits 12 toward the center of the fuel. VThis shield may be composed of one or a series of sections, as found most convenient. -f y The top 4 is turned down at its front edge wall 3, immediately below this deiiector, are a series of inlet-openings 18, controlled by a damper 19, while near the bottom of the said wall is an opening 20 with a door for clean'- ing the air-heating chambers.

The operation` of the invention as thus far described is substantially as follows: Air is deflected bythe deflector 17 tothe openings 18 and into the preliminary air-heating chamber, from whence it passes through the opening 15 to theI secondary air-heating chambers 10. The preliminary air-heater is common to `all the secondary chambers, which is of the utmost importance, as it subdivides the air into smaller volumes, whereby the temperature is roo quickly raised, and at the same time enables me to introduce to the fuel heated air-currents of var ng temperatures. This is true vin view oft e fact that the fire, as a rule, is

not of the same incandescence throughout. m5

Hence the air in the chambers will be heated Vaccording to thev condition of the fuel adjacent it. ing chambers is delivered to the fuel throu h the exits 11 and 12.` Hence the body of t el 11o 7o chambers with a plurality of tapering air- The airfrom the secondary air-heatfuel is supplied with heated jets of air at different levels of varying temperatures, while a series of streams of heated air are deflected approximately toward the center of the top of the fuel. The jets of air delivered to the body of the fuel liberate and assist in igniting the gases, and as the latter naturally ascend the streams of heated air from the exits l2 meet, mix, and drive the gases back into the incandescent mass of fuel, where ignition takes place. j

The air-duct I have designed to coact with the air-heaters above described consists of a pair of plates 25, preferably of fire-brick, each of which is horizontally and oppositely curved and provided on their lower sides with a series of depending projections 26, forming between each other a series of openings 27 for the passage of the products of combustion. This construction when the two plates are positioned forms, with the stove structure, an air-duct open at its bottom and wider at its center than at its ends. The rear plate is provided with a series of perforations 28 for the vexit of air to the escape-flue 29.

The air-duct may be supplied with heate air from several of the secondary air-heating chambers l() by ducts 30, which may be also perforated, as at 81, and also through openings 32 in the top 4 or at the ends from chambers in sides of the stove controlled by dampers.

The products of combustion passing through the passage 33 to the gas-chamber or flue 29 require a large supply of heated air of the proper proportion and temperature to prevent the formation of smoke-gas, and to so arrange the parts to properly coact I found it necessary to devise the peculiar form of air-duct. It will therefore be seen that if any unconsumed gas reaches the escape-ilue 29 and can be ignited by a mixture of air such mixture and consequent ignition will be the result. Y

In the modification shown in Fig. 3 the partition 6a and intermediate partition 13a are so constructed that the exit 12a is formed without the use of a shield, and, as shown in Fig. 4, I propose introducing streams of heated air to the top of the fuel through the exit 12b and also introduce a plurality of jets toward the top of the fuel from a supplemental chamber 35, which extends from the partition 6b to the air-duct 5.

The modification shown in Fig. 9 involves the same principles of operation of heating air as in the other forms described, except that the air is introduced at the bottom of the preliminary air-heating chamber instead of the top and the secondary chambers deliver air below the grate. This arrangement permits me to use my invention to supply heated air to the under side of and through the body of fuel.

What I claim as new isl. In a downdraft-range, the combination of a fire-pot, a pendent air-duct therein which is formed with openings, a space being formed between the bottom of the fire-pot and the pendent air-duct, a single preliminary airheating chamber arranged to receive air from the atmosphere, a plurality of secondary airheating chambers adjacent the reliminary air-heating chamber, all of saidp secondary air-heating chambers communicating with the preliminary air-heating chamber and formed with exit-openings which communicate with the fire-pot, the heated air being drawn through the exit-o enings to the firepot downwardly and un er the air-duct by the draft, said air being mixed with the air entering the openings in the air-duct.

2. In a downdraft-stove thecombin-ation with a preliminary air-heating chamber, of a series of secondary air-heating chambers, the preliminary chamber being common to all the secondary chambers, an air-duct composed of oppositely-curved plates havin(r proj ections at their lower ends, the air-du'ctueing disposed to form a flue at the bottom, and a duct or ducts connecting and communicating with the secondary chambers and the airduct, substantially as described.

3. In a downdraft-stove, the combination with a preliminary air-heating chamber, .of a series of secondary air-heating chambers, the

preliminary chamber being common to all the secondary chambers, exitso p enings formed in the secondary chambers vat different levels to introduce jets of air to the body of the fuel, an exit-opening formed near the top Lof each secondary chamber for introducing streams of heated air above the bed of fuel, an airduct supported in the stove'to form a flue at the bottom thereof, and a ilue or ilues provided with air-exits, connecting the air-duct and the* secondary chambers above the airexits near the top, substantially as described.

4. An air-duct comprising a pair Aof oppositely-curved plates provided .on their lower edges with projections and intermediate spaces, the two plates when assembled forming a duct which is of greater area at the een ter than `at its ends, and means for supplying heated air to the aird:uct, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

EDWIN R. CAHOONE.

Witnesses:

FRANK SHRAUDER, S. S. PRIMMER.

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